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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcaaf96b7b69945b287c6b6d3c5aac95e7ac514010718265b3311eb9a2e49b05' 
  AND token = 'Oq4gZ4771lcls2Ne1tA2QVi71M4BijoNOUO9Vsrqlao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}